Drill grinder



E. E. HAYNES DRILL GRVINDER June 28, 1949.

z'sneets-sheet 1 Filed July 11, 1947 z 5 o a 5 V z w 0mm M M4 8 H .w m5. w w 1 m w z 8 .Y W T Z f y Patented `lune 28,i 1949 UNITED STATES PATENT OFFICE 4 Claims.

This invention relates to grinding machines, and more particularly to a machine for grinding masonry drills.

It is a principal object of the invention to provide a hydraulically operated device for grinding both front angles of a masonry drill. In a preferred embodiment of the invention, two tables are arranged to move intermittently along converging paths, and each table carries a cup wheel that is adapted to grind the tip of a masonry drill.

The invention is illustrated in the accompanying drawings, but it is understood that modifications may be made therein without departing from the spirit of the invention as hereinafter claimed.

Figure 1 represents a plan view of the new and improved grinder.

Figure 2 is an enlarged fragmentary Vertical section of the grinder, taken along the line 2-2 of Figure 1.

Figure 3 is an enlarged fragmentary Vertical section through the grinder, taken along the line 3- 3 of Figure 1.

` Figure 4 is a horizontal section, taken through v the line 4-4 of Figure 2.

Figure 5 is a side elevation of the chuck for holding the drill.

Figure 6 is a rear elevation of the structure shown in Figure 5.

Figure 7 is a front elevation of the structure shown in Figure 5.

Figure S is a plan View of the structure shown in Figure 5.

As shown in the drawings, the invention is shown applied to a horizontal bed plate IOU. Two tables lil and |02 are movable horizontally on the bed plate HMB, and for this purpose the bed plate S may be provided with two pairs of tracks |03 and IM for the table Il, and tracks m and 106 for the table N12. As illustrated, these pairs of tracks converge toward each other, so that the tables HH and m2 may approach the angle intermittently.

Hydraulic means is provided for actuating the tables IOI and |02. This means comprises a cylinder a piston 2 operable in the cylinder l, and a piston rod 3. Each of the tables Hli and M12 is provided with such a hydraulic system.

Each cylinder is bolted to the bed plate HIS by means of one or more brackets 4. Each cylinder is coupled by a pair of couplings 5 to two conduits 6, which will be described more particularly hereinafter. Each piston rod 3 is fastened to its table IOI or 11.12 by suitable fastening means 8.

Consequently, as the piston 2 is actuated in the cylinder i, the cylinder l will remain stationary with the bed plate |00, and the piston rod 3 will move the table |0| or M22.

The tables 10| and ||J2 are movable with respect to a drill held by means to be described more particularly hereinafter, and mounted on each of the tables IM and |02 is a cup wheel 3 designed to grind the drill. Each cup wheel 9 is mounted on a metal mounting plate IO secured to a horizontal shaft ll The shaft II is journaled in a housing I 2 that may be provided with ball bearings 14. The housing |2 is carried in an upright extension of the table 40| or |02. The cup wheel 9 is pro- Vided with a centering shaft |5 to properly align the cup wheel 9 with the shaft I I. The cup wheel 9 is fastened to the mounting plate IO by means of one or more screws |6. A pulley 11 is fixed at one end of the shaft ll, and a belt IB transmits power thereto from a motor 19 supported on the horizontal face of the table HJI or M12. The bed plate IOO is provided with a horizontal opening 26 to permit connection of the conduits 6 to the cylinders I.

A chuck 21 is designed to hold the work to be ground. The chuck 21 is provided with a collet 28, which has a series of slots 29 to facilitate insertion and removal of a tool 333, in this instance a masonry drill. The face of the chuck 21 contains an arcuate channel 3| which is marked with graduations 32. A set screw 33 holds an indicator 34 in any desired position in the channel 3 l. The indicator 34 will thereby indicate any desired clearance angle to be applied to the drill 33. The chuck 21 rests on a base plate 35, and the bottom plate 36 of the chuck is dovetailed to slide in the base plate 35. The bottom plate 36 is provided with a longitudinal hole 31 to accommodate a feed screw, as will be described more particularly hereinafter.

The small end of the collet 28 is provided with `threads 33 to engage similar threads of a base Kill at the rear of the chuck 21. This base 40 is pro- Vided with a reduced portion 4|. The rear portion of the base 43 contains a series of holes 42 adapted to receive a sharp ponted instrument whenever the collet 28 is screwed into the chuck 21 or removed therefrom. A lever 43 is pivoted on a pivot pin 44 for the purpose of opening and closing the collet 23. When the collet 23 is screwed into the base 43 the proper amount, and the lever 43 is pushed down, the slots 29 in the collet 28 will be closed and the collet 28 will be locked. When the lever 43 is moved up, the slots 29 will be opened, and the drill 30 can then be withdrawn. The lever 43 is bifurcated, and the' screw 49 that screws into the bottom plate "3d through the threaded hole 37. Obviously-fasthe wheel 48 is rotated in one direction or the other,

the bottom plate 3% and the cl'mcl:f-nmur'ited'l thereon will be fed towardltheigrindingwheel 9 or away therefrom. The feed screw itsell' has no axial movement, being prevented-frorr such movement by a collar 5B.

'Th'ehydraulic systemffor `each of 'he tables'iill `vTheconduits 6 lead to a hydraulic cylinder in which a piston 53 is horizontaliy'reciprocabie.

This cylinder :52, -as hercinbefore` indicated, Vis'below the surfaceof'fthe bedplate let. A 'pump operablezby a motor shaft 55, is designed to pump oil=0rsimilar iiuids intothe cylinder Themetorzshaft,rotatesza drive wheel .poeitened One of the tables HH and-m2 is provided with apairof dogs H` and 12, that are .adjustable'to anydesired feed. That is, the dogs 'Si and "ifrmay be moved towardeach other or away from other .to shorten or lengthen the movement' of both' the tables' 1m and m2. A reverse lever 'E3 operates a shaft'ili that is connected to the connecting rod of the hydraulic cylinder'. The reverse .leveri'iis mounted'on a base 15 formed on the`.bed: plate H10.

In `the operation of the device, the tables i'ti and N32 'are simultaneousiy operated to bringthoir 'grinding'wheels 9 intermittently against the'tip of th'edrill tt, which has already been'adjusted in the chuck Z'i. When the valves ti and 82 in the v'cylinder '52 are open, the fluid passing through Ithe openrvalve 8|`wi1l exert pressure through the .*'r -con'duits-'to drive the pistons 2 in the cylinder to the right, carryinglthe tables mi and M22 -to^theright At the same time, theoil will be `vforced out ofl the other end of the cylinder I and through the open release valve 82. After 'the tables Ill! and m2 have moved to the limit ofl their 'travel to the right, the dog "ii 'will push the'lever 'fT3ito the right, actuating the shaft Viii about'the `pivot W to move the'co'nnecting rodofthe'cyl- 'inder' to 'the left.' This will close the valves zlrand (52; and openthe'valves 33 and 84 in'the 2 cylinder "52. -exerted to move the tables HH and m2 to the left, rand'this moton of both tables will'be' rep'eated The "hydrauiic pressure will now be intermittently until'the desired gifinding has been I claim: `1. A machine 'for grinding two different 'fac'es 'of aztool .lying infintersecting planes, said mafchine comprisinga relatively stationa'ry'bed-ia The end of this I` 4 pair of tables mounted on said bed for movement toward and away from the intersection of said planes, means for positioning the tool to be ground, powered grinding Wheels mounted on said tables for engaging the related faces of the tool, and Operating means for alternately moving said tables toward and away from the intersection of said planes whereby one of said grinding wheels moves toward the intersection and across therelated facelof the tool while the other grinding-wheel moves away from the intersection and across the face of the tool related thereto.

2. A machine for grinding two different faces of -a tool lying in intersecting planes, said machine eomprising a relatively stationary bed, a pair offitables mounted on said bed for movement 4Atoward and away from the intersection of said planes, means for positioning the tool to be ground, powered grinding wheels mounted on said tables for engaging the related faces of the tool, operating ineans ,for alternately fmoving said tablesftoward and away from the intersection of said planes whereby one of said `grinding wheelsmovestoward the intersection-and `across the related face of the tool while'the other grinding wheel moves awalr from the intersection and 'across the face of the tool related thereto, said Operating means comprising separate operatng components operatively connected between each of said tables and said bed, continuously operable .drive means effectively .connecteddirectly to .both of said Operating components for operating the .same in either direction, and control means Operating between. each table and said 'base plate and effectively connected'to saidcon- Vtinucusly operable drive means whereby the amplitude of movement and the direction of movement of said tables are determined by'the arrival of said tables into positions corresponding to terminals of the predetermined amplitudes'of their movements relatve to said bed.

3. A machine for grinding'two different faces 'of a tool lying in intersecting planes, said'machine comprising a relatively stationary be`d,^a

pair of tables mounted on said bed for movement toward and away from the intersection'of said `planes, means for positioning the tool` to be ground, powered grinding wheels mounted on said tables for engaging the related facesv of the tool, and Operating means for alternately moving said tables toward' -and 'away from the intersection of said planes whereby one of saidgrind- `ing Wheels movestoward the intersection 'and across the related face of the tool while the other grinding wheel moves away from' the intersection and across the face of the tool'related thereto, said Operating means comprising separate lop- -erating "components voperatively connected beween each of said tables and said bed, continuously operable. drive means efiectively connected directly to both of said Operating components foroperating the same in either direction,.fand controlmeans Operating between each table'and said base plate and effectively connectedzto'fs'aid -continuously operablefdrive means whereby the `continuously'operable driving means comprising a hydraulic cylinder, a valving 'piston thereimand conduits leading from hydraulic cylinder to said hydraulic jacks whereby said jack pistons are moved in one set of directions in one position of said valving piston and in another set of directions in another position of said valving piston, and powered hydraulic fluid supply means for said hydraulic cylinder.

4. A machine for grinding two difierent faces of a tool lying in intersecting planes, said machine comprising a relatively stationary bed, a pair of tables mounted on said bed for movement toward and away from the intersection of said planes, means for positioning the tool to be ground, powered grinding Wheels mounted on said tables for engaging the related faces of the tool, and Operating means for alternately moving said tables toward and away from the intersection of said planes whereby one of said grinding Wheels moves toward the intersection and across the related face of the tool while the other grinding wheel moves away from the intersection and across the face of the tool related thereto, said Operating means comprising separate Operating components operatively connected between each of said tables and said bed, continuously operable drive means effectively connected directly to both of said Operating components for Operating the same in either direction, and control means Operating between each table and said base plate and eifectively connected to said continuously operable drive means whereby the amplitude of mcvem'ent and the direction of movement of said tables are determined by the arrival of said tables into positions corresponding to terminals of the predetermined amplitudes of their movements relative to said bed, said separate Operating components comprising hydraulic jacks comprising cylinders secured to said tables and pistons secured to said bed, said continuously operable driving means comprising a hydraulic cylinder, powered hydraulic fiuid supply means for said hydraulic cylinder, conduits leading from said hydraulic cylinder to said jack cylinders whereby said jack piston of each jack can be moved in opposite directions, valving piston in said hydraulic cylinder arranged to be moved to positions in said hydraulic cylinder to occlude som'e of said conduits while opening others of said conduits whereby to determine the amplitude and direction of movement of said jack pistons and the tables associated therewith, and means effectively connecting said Valving piston with said control means.

ELIZABETI-I E. HAYNES.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATEN'I'S Number Name Date 417,615 WebSter Dec. 17, 1889 1,042,817 Newman Oct. 29, 1912 1,139,485 Busler May 18, 1915 1,255,'799 Schumacher Feb. 5, 1918 2,127,210 Dunbar Aug. 16, 1938 2,168,596 Hall Aug. 8, 19rm 

